Mutes the sound that plays for new applicants.

The eye's glow effect still animates.

Useful if you want to play with sound effects on, but don't want to be bothered by the group finder's alerts.

 
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How does it work?

When the AddOn loads, it overrides the global function QueueStatusMinimapButton_OnGlowPulse, which is called by Blizzard's own logic to check if it should play the alert sound.  Blizzard's developers made it easy.